Adjacency List & Prim's Algo

[s.johns]

Thanks for the tip about the Map class

How do I initialize the adjacencyList though? When I try to run clear() on the adjacencyList, it comes up saying " variable adjacencyList might not have been initialized"

import java.io.*;
import java.util.*;

public class Primsmap
{
	public static void main(String args[])
	{
		// initiate new adjacencyList
		Map<Vertex, List<Edge>> adjacencyList;

		adjacencyList.clear();
	}
}

class Edge{
  // name of vertex
  Vertex to;
  // stores the weight
  int weight;
}

class Vertex{
  // stores the name the vertex points to
  String name;
}